Buffing wheel hub



Aug; 14, 19,45. H. E. HARGY, sR

BUFFING' WHEEL HUB Filed Nov. 29, 1943 INVENTOR Harry E. /aryy .Sn BY 4A TTYs 5..-lll\lllllllll\llll\\l s .llllllllllllll lll! w llllllllllllllllll llllllllllllll il! *waff/m A Patented Aug. 14, 1945 BUFFING WHEELHUB Harry E. Hargy, Sr., Sycamore Township,

Hamilton County, Ohio Application November 29, 1943, Serial No. 512,200

7 Claims.

The present invention relates to buiiing wheels and is particularlydirected to an improved hub for mounting a buing wheel to a rotatingshaft.

Heretofore hubs for mounting bufng wheels of small diameters to therotor shafts'of electric motors developing small power outputs have beenmade of relatively heavy parts, such as cast iron or the like, which, inoperation, resulted in undue wear of the motor shaft bearings. Thisbearing wear set up vibrations in the rotating buing wheel hub and shaftwhich caused the set screw between them to frequently work loose andsaid set screw thereafter required constant tightening adjustments.Furthermore the'frequent adjustments of this set screw between theinelastic metal parts of hub and. shaft created a permanent offcenterbulge inthe shaft arbor holes formed in the hub which thereafterprecluded the hub from concentrically,positioning the wheel on saidshaft.

t is therefore an object of the invention to provide a novel hubstructure which overcomes the foregoing disadvantages and which isparticularly adapted for mounting bufling wheels of small diameters tothe rotor shafts of electric motors developing small power outputs.

Another object of the invention is to provide a bumng wheel hub having areenforced clamping disc made of wood in which is threadedly secured aradially positioned set screw precluded from loosening by the elasticqualities of said disc and the manner in which said set screw isassociated with the disc.

Another object of the invention is to provide an improved hub structurewhich is of light weight, docs not produce undue wear on the motor shaftand positively clamps an associated buiiing wheel to the rotating shafttherefor,

A further object of the invention is to provide a buing wheel hub whichmaterially dampens vibrations set up in said wheel when its peripheralworking surface comes in contact with rough or uneven surfaces on thearticle operated upon.

Another object of the invention is to provide a hub structure which willpermit its manufacture from a wide range of materials such as wood, andvarious plastics thereby greatly reducing its actual cost ofconstruction.

Another object of the invention is to provide a mounting means whichaccurately positions and rigidly holds a buing wheel in rotatcryequilibrium regardless of the diameter of the arbor hole thereinrelative to the diameter of the rotating shaft upon which said wheel isto be mounted thereby providing a practical hub for converting tocertain uses a great variety of discarded bufllng wheels which haveunused central portions.-

Other objects will be apparent from the following specication anddrawing which illustrates a preferred embodiment of my invention and inwhich:

Fig. l is a fragmental, side elevation of a buffing wheel mounted on arotating shaft in accordance with my invention.

Fig. 2 is a cross-sectional View taken on line 2 2 of Fig. 1.

Fig. 3 is an exploded, perspective view of the device shown in Fig. 1.

Fig. 4 is an enlarged, central cross-sectional view of the device ofFig. 1 showing the manner in which said device accommodates varioussized arbor holes formed in bufnng sections of the wheel.

The numeral B indicates a bunlng wheel which is illustrated ascomprising three sections 'I. Each section is formed by a plurality offabric laminations 8 (Fig 4) bound together as by lines of stitches 9and provided with centrally disposed arbor holes I0. These arbor holesare illustrated in Figs. `1-3 as having a diameter equal to the diameterof the motor shaft II upon which thel Wheel is coaxially positioned forrotatory operation on the work to be' buied, while Fig. 4 shows themanner in which my hub device is adapted to operatively mount a numberof buning sections having various sized arbor holes as will be morefully described hereinafter.

The device for rigidly mounting a number of sections 'I concentricallyon 'the rotating shaft I I to form a buning wheel, consists of aresilient clamping disc I2, preferably made of wood, and an inflexiblefastening disc I 3, each having formed therethrough a centrally disposedhole I4 and I5 respectively, for snugly receiving the shaft II`. Areenforcing cap disc I Il) may be positioned between the clamping discand the wheel, and is provided with a concentrically disposed arbor holeIII through which the shaft II passes. It will be understood that theinflexible cap disc I I0 may be omitted without materially altering thefunctions of my buing Wheel and it is therefore employed merely to giveadded support to the resilient clamping disc I2. As illustrated in Figs.1 and 4, the fastening disc and the cap disc are disposed on oppositesides of the buflingk wheel, and are in contact with the circularportions of the exposed sides of the outermost sections 'I adjacent tothe arbor holes therein.

An outer cap disc I6 has an inflexible body portion, abuts the clampingdisc and is concentrically positioned on the shaft II, said cap discserving to reenforce the clamping disc adjacent its outer portion. Asillustrated in Fig. 5, the arbor hole I'I. formed in the cap disc I6snugly receives the periphery of the shaft I I.

In assembled positions on the shaft, the shaft receiving holes in all ofthe discs and the arbor holes in the bufng wheel sections are in coaxialalignment, and are rigidly held together by a number of elongated drawbolts i8, preferably entered through the fastening disc I3 and passthrough the bufng wheel sections, the clamping disc I2 and the ap discsIII) and I6. The draw bolts are disposed in parallelism with the'shaftII, and are spaced at equal radial distances ing adapted to strengthenthe wooden clamping' disc I2 disposed therebetween. The clampingpressure may also be greatly reduced for the reason that said bolts passdirectly through, and are in close contact with the material of thebuiiing wheel sections, thus preventing tangential movement of saidsections set up by centrifugal force when the wheel'is in operation.

A hub set screw 2D is threaded in a radial direction through the woodenclamped disc I2, and threadedly engages a nut 2| positioned adjacent itsinner end. It Will be noted that thevset screw is positioned in thelongitudinal direction of the grain of the wood from which the cap discis formed to thereby preclude splitting of the clamping disc when theset screw is tightened. The nut 2| is seated against rotation in asquare groove 22 formed axially through the disc I2 at 4a portionadjacent to and in communication with the shaft hole I4 therewith. Bydrawing up on the screw, a resilient clamping action occurs between thenut 2 I, the outer surface of the groove .22, the wooden clamping discI2 and the shaft II. This resilient clamping action constantly urges thelower end of the screw against the shaft and precludes loosening of thescrew during operative rotation of the bufling wheel.

In clamping position (Figs. l and 4) the head of the set screw 20 isdrawn by bolt 2I against the exterior surface of the clamping disc' I2,thereby compressing the material of the disc between the head and thenut. This compression serves to lock the screw in operative clampingposition, and further prevents the loosening of the set screw in thehub.

Because of the reduced clamping pressure required to hold the bufiingwheel sections in D- erative position and the characteristics of thematerials of construction for the discs employed in my hub, thevibrations set up in the wheel during operation are materially dampened,thus conducing to a smoother and less harsh bufiing action of the wheelIt will be noted that the hub of this invention involves asimplification of prior art devices, which results in a reduction of thecost of producing these devices due to saving of metal, and alsoproduces an increased eiliciency in carrying out its primary function. A

It is a practice of the buing wheel art for a manufacturer to use onlythe outer peripheral surface of a large wheel of 14 inches in diameteruntil it has been reduced to a diameter of about 6 inches, at which timeit is discarded as inemcient to perform its particular operation. Thesediscarded Wheels and wheel sections are useful for a number of otheroperations and as they generally are provided with arbor holes ofvarious sizes and of sizes greater than the motor shaft used for thesecond operation, it becomes necestions upon a single shaft. Asillustrated in Fig. 4,

f my device is particularly adapted to mount discarded buinng wheelsections 'I having various sized arbor holes 23, 24, and 25 therein on ashaft I I of a smaller diameter than the arbor holes in said sections.The method of building up the wheel from these sections consists insuperimposing the sections one upon the other so that all :the varioussized arbor holes are in coaxial relationship, The fastening disc I3 isthen aligned with the'arbor holes by disposing the shaft hole thereforin coaxial alignment with the common axis of said arbor holes. Holes arethen punched ith-roughv said sections by using the disc as a die tolocatev their positions. The draw bolts are then inserted through thefastening disc and the sections, then through the clamping disc and capdisc and the nuts I'S are then threaded to the -ends of the ybolts andthe entire structure is made lrigid by drawing up on said bolts.

It will therefore -be understood that my device is capa-ble of mountingsections which have arbor a holes ranging from the diameter of the motorshaft and/or the motor shaft holes in the discs of my device up to adiameter approximating twice the radial distance between the draw boltsand the center of the shaft. When :said sections having enlarged arborholes are employed in my device there is no danger of the sections beingmoved from rotary equilibrium because not only does the compressiveforce exerted by the draw bolts clamp said sections to the device, butthe draw bolts pass through -said sections and integrally unite them tothe device.

What is claimed is:

1. In a device of the character described the combination of a rotatableshaft, a bumng wheel positioned coaxially with the shaft, a resilientclamping disc for dampening vibrations set up by operative rotation ofthe wheel, a. fastening I disc, each of said discs having a centrallydisposed arbor hole formed therethrough for snugly receiving the shaft,said discs being in contact with `opposed sides of the wheel, aninflexible cap disc mounted concentrically on the shaft and engaging theexposed face of the clamping disc, and draw=bo1ts running through all ofthe said discs andthe wheel and disposed in parallel with the shaft andspaced at equal radial distances therefrom.

2. In a device of the character described the combination of a rotatableshaft, a bufling wheel positioned coaxially with the shaft, a resilientclamping disc and a fastening disc each having acentrally disposed shafthole formed therethrough for snugly receiving the shaft, said discsbeing in contact with opposed sides of the wheel, an inflexible cap discmounted concentrically on the shaft and engaging the exposed face of theclamping disc, means for securing the wheel to said discs, an axiallydisposed groove formed in .the clamping disc adjacent to andcommunicating with the shaft hole therein. a nut in the bottom of thegroove, a threaded bore formed radially in the clamping disc andextending from its periphery to the groove, and a set screw threadedthrough the bore and the nut and bearing at its inner end against theshaft.

3. In a buiiing Wheel hub the combination of a, resilient clamping disc,reenforcing discs in engagement with opposed sides of the clamping disc,a set screw threaded radially through the clamping disc, a nut seatedagainst rotation in the clamping disc and threadedly receiving anintermediate portion ofthe screw, and means for rigidly fastening thediscs and the Wheel.

4. In a buing wheel hub the combination of a wooden clamping disc,reenforcing discs in engagement with opposed sides of the clamping disc,a set screw threaded radially through the clamping disc in the directionof its grain, a nut seated against rotation in the clampingdisc andthreadedly receiving an intermediate portion of the screw, and means forrigidly fastening the discs to the Wheel, said screw in operativeposition being in resilient clamping position and also locked againstrotation by resilient compression of the material of the clamping disc.

5. In a buiiing wheel hub the combination of a resilient clamping disc,a reenforcing disc in engagement with the clamping disc, a set screwthreaded radially through the clamping disc, a nut seated againstrotation in the clamping disc and threadedly receiving an intermediateportion of the screw, and means for rigidly fastening the discs and theWheel.

6. In a device of the character described the combination of a rotatableshaft, a buffing Wheel positioned coaxially with the shaft, a resilientclamping disc for dampening vibrations set up by operative rotation ofthe wheel, a fastening disc, each of said discs having a centrally-disposed arbor hole formed therethrough for snugly receiving the shaft,said discs being on opposed sides of the wheel, an inflexible cap disclmounted concentrically on the shaft and engaging the exposed face ofthe clamping disc, and means for fastening said discs to the wheel.

'7. In a device of the character described the combination of arotatable shaft, a bufimg Wheel positioned coaxially with the shaft, aresilient clamping disc for dampening vibrations set up by operativerotation of the wheel, a fastening disc, each of said discs having. acentrally dis- HARRY E. HARGY, SR.

